Anhydrous hydrogen fluoride for industrial use — Determination of sulphur dioxide content — Iodometr...
Applicable to products having SO2 contents between 0.002 % (m/m) and 0.20 % (m/m). The principle consists in addition of a measured volume of iodine solution to a test portion. Back-titration of the excess iodine using a standard volumetric sodium thiosulphate solution and calculation of the SO2 content from the amount of iodine used.
Potassium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) co...
The method is applicable to products having a calcium content equal to or greater than 0.002 % (m/m). The principle consists in titration of the calcium with a standard volumetric solution of the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA disodium salt) in the presence of 2,2'-(ethylenedinitrilo)diphenol Äglyoxal-bis-(2-hydroxyanil)Ü as indicator, after elimination of…
Sodium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) compl...
The method is applicable to products having a calcium content equal to or greater than 0.002 % (m/m). The principle consists in titration of the calcium with a standard volumetric solution of the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA disodium salt) in the presence of 2,2'-(ethylenedinitrilo)diphenol Äglyoxal-bis-(2-hydroxyanil)Ü as indicator, after elimination of…
The method is applicable to alloys having insoluble zirconium contents between 0,02 and 0,3 %. Rare earths, thorium and silver do not interfere. Specifies principle and procedure of the method, reagents, apparatus, sampling, expression of results and test report.
Sodium fluoride for industrial use — Preparation and storage of test samples
Relates to crude samples intended for the determination of moisture content and dried samples for chemical tests. Processing by grinding and sieving until the sample passes completely through a sieve of mesh aperture 0.125 mm. Thoroughly mixing and drying and storing in a tightly closed container.
Fibre building boards — Determination of sand content
The purpose of the method specified is to obtain an indication of machinability by cutting tools. The principle is based on the complete combustion of test pieces and weighing the sand remaining in the desiccator at the end of the procedure. The tubular hearth used to ignite the test pieces is shown in the figure.
Boric acid, boric oxide and disodium tetraborates for industrial use — Determination of chromium con...
Alkaline fusion of a test portion by sodium carbonate and subsequent neutralization by sulphuric acid. Measurement of the absorption of the complex formed by chromium and diphenylcarbazide at a wavelength of abour 540 nm after adding sodium azide for elimination of the colour caused by manganese.
diSodium tetraborates and crude sodium borates for industrial use — Determination of water content ...
Heating a test portion in a combustion tube at 250 0C, later at 500 0C. Passing through the liberated water carried by a flow of nitrogen into a tared absorption vessel filled with magnesium perchlorate. Weighing the absorption vessel and determination of the mass of water by difference.
Boric acid, boric oxide and disodium tetraborates for industrial use — Determination of chloride con...
The principle consists in titration of the cloride ions with standard volumetric mercury(II) nitrate solution in presence of diphenylcarbazone as indicator until the colour of the solution matches the mauve of the standard end-point matching solution.
